Key-seat-cutting machine



Patented MELT--20, 1883.

tklinrl. II II I.

W. P. DAVIS.

KEY SEAT (HITTING MACHINE.

(No Model.)

UNITED; STATES PATENT OFFICE.

WILLIAM P. DAVIS, OF NORTH BLOOMFIELD, NEW YORK.

KEY-SEAT-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 274,287, dated March 20, 1883.

h Application filed November 29. 1882. (No model.)

To all whom itmay concern:

Be it known that I, WILLIAM P. DAVIS, of

North Bloomfield, Ontario county, New York,

improved construction of the driving mechan ism, and in the general arrangement of the apparatus, all as hereinafter more fullydescribed and specified.

. My improvements in key-seatcutting machines are represented in the annexed drawings, in which Figure 1 is a front elevation. Fig. 2 is a plan View. Fig. 3 is a vertical sec tion on the line so a, Fig. 2, showing the driving mechanism. Fig. 4.- is a plan view of .the

feed mechanism. Fig. 5 represents the mechanism for adjusting t-heinclination of the cutter. Fig. 6 represents one of the chuckdolocks. Fig. 7 represents the adj ustableslide on which the chuck-block moves. Fig. Sis a longitudinal section of the chuck-block on the line y 3 Fig. 6. Fig. 9 is a transverse section through the chuck-block on the lineqz 2, Fig. 6.;

In the accompanying drawings, A represents the frame; B, the tablefO, the clamp by which the work is secured to the table; D, the reciprocating saw or. cutter; E, the driving-shaft; F, the crank-disk; G, the pitman. H represents the loose pulley, and H the pulley on which the belt'is placed when the machine is in operation. The pulley H and the pinion J are formed in one piece orattached together and arranged to revolve loosely on the shaft E. The pinion J meshes into the gear K on the outer end of the shaft 1. The pinion L on the inner end of the shaft I drives the gear or. crank-diskF, in the face of which is inserted the stud or crank 61., to which the lower end of the pitman G is connected. The shafts E I are preferably supported parallel to each other in a horizontal position by the frame N, attached to the side of the main frame A of the machine. The collar on the outer end of the shaft E serves to hold the loose pulley H in position. The upper end of the pitman G is pivoted to the cross-head b, which reciprooates between parallel guides attached to the sides of the machine. The lower end of the cutter D is detachably connected to the cross-head b. By this arrangement of devices a reciprocating motion at suitable speed is imparted to the cutter D from the pulley H, while the mechanism possesses the advantages of simplicity, compactness, and cheapness'of construction. I

- The work is. secured to the table by the clamp U, which is forced down thereon by the nuts on the screw-rods g g. The clamp also serves to'isupport the upper end of the cutter D and the mechanism for feeding thechtter. The rods g 9 pass through a series of slotted openings in the clamp O. A corresponding series of threaded holes is made in the plate 13 to receive the lower ends of the rods 9 9, so that the machine maybe adapted to receive work of different sizes. The rods g gare also provided with a series of collars, h h, by which the distance between the clamp and the table is altered, so as to adapt the machine to work of different thicknesses. The cutter D is fed forward into the work by a slide, Z, provided with a rack meshing with the pinion n, operated by the hand-leverP. The pinion nis arranged to rotate on the stud 0, Fig. 4, inserted in a boss attached to the clamp O. (Represented in dotted lines in Fig. 4.) An opening is formed in the vertical flange of the clamp G in order to permit the teeth of thepinion n to mesh with the rack on the slide 1. The motion of the hand-leverP will thus be imparted to the slide 1 and the cutter D, to force the latter against the work, as represented by the dotted lines in Fig. 4.. The back of the cutter D rests against a shoulder or notch formed in the end.

of the slide 1. The slide is held in place on the clamp G by a cap or cover, 1", attached .to the clamp in any suitable manner. In order to provide for the adjustment of the cutter D at any desired anglewith the table 13, the cap 1' is provided with a boss, 1, through which passes an adj usting-screunc, the point of which bears against a lug,s, projecting upward from the slide Z.

The operation of the parts will be readily understood by an examination of Fig. 5. The

screw c operates as a stop to limit the motion 2 QWLES? of the slide 1, and consequently to determine the position of the face of the cutter D relatively to the surface B at the end of the cutting operation. By this arrangement I am enabled to cut tapering slots or key-seats of any required depth at either end.

By the use of the square on the table B the vertical alignment of the cutterD is easily s ecured, as represented in Fig. 5, the lug s being in contact with the end of the set-screw '0. The pitch of the screw '0 being known, it is easy to secure any desired taper in the keyseat by giving the screw 11 the requisite number of revolutions or fractions of a revolution. Thus if the lead of the screw 11 is sixteen to the inch and it be desired to give the key-seat a taper ot' one-sixteenth of an inch in its whole length, a single turn of the screw Q; will effect the desired adjustment.

The chuck-blocks It R are affixed to the upper surface of the table for the purpose of regulating the depth of the key-seat and to secure uniformity in the work done. The chuckblocks also serve to hold the work firmly against the action of the cutter. The chuckblocks consist of a suitable slotted bar, having at one end a face to bear against the work and at the other end a set-screw, w, by which the bar can be adjusted lengthwise on the slide T.' The chuck block is secured to the table in different positions relatively to the cutter by the screw amassing through both the chuck-block and the slide, and by the pin 3 projecting downward from the slide. A series of threaded openings, 2 2, Fig. 2, at equal'distances apart, are made in the surface of the table B. These openings are arranged in two radial lines directed toward the cutter D. The distance between the holes corresponds with the distance between the screw 00 and the pin 3 so that the chuck-blocks may be setin posisitions to accommodate any desired size of work. The slide T is held in place on the surface of the table by the pin 2 entering one of the holes 2, while the chuck-block proper is adjusted on the slide by means of the screw 10,

In oruntil its face bears against the work. der to adjust the machine to cut a key-seat of a given depth-say one-fourth of an inch-the operation is as follows The cutter is lined up square with the face of the table, the lug 8 bearing against the screw '0. The workis then placed against the cutter and the chuck-blocks adjusted against the work. Four turns of the screws w w (ofa lead of sixteen to the inch) will now force the work into such a position that on the completion of the cutting opera= tion thekey seat or slot made by the cutter will be one-fourth of an inch deep, measured from the interior surface of the hole in the work. The chuck-blocks are clamped firmly in position on the table by the screws 00 or during the cutting operation.

If desired, the machine may be set to cut a tapering key-seat by means of the screw 12, at the same time that the depth of the out is adjusted by the chuck-blocks R R.

In the practical operation of seat-cutting machines it generally occurs that the bottom of the cut is left slightly rounding on account of the springing of the cutter. This difficulty is entirely obviated by the use of the arljusta-..

ble stop o, as by allowing the cutter to make a few strokes after the motion of the slide has been arrested by the stop the bottom of the key-seat is finished to a true surface.

I claim 1. The combination, with the reciprocating cutter D, of the clamp G, slide 1, and set-screw 21, arranged to arrest the motion of the slide at the point desired, substantially as and for the purposes set fort 2. The combination, with the table B, clamp O, and reciprocating cutter D, of the chuckblock R, provided with adjusting-screw to, substantially as described.

3. The combination, with the table B, provided with a series of equal-spaced holes, z z, of the slide T, having pin y attached thereto, chuck-block R, clamp-screw w, and adjustingscrew to, substantially as described.

4. The combination, with the frame A, table B, clamp O, reciprocating cutter D, pitman G, crank a, shafts E and I, gearing J KL F, and pulley H, substantially as described.

5. The combination, with the table B, clamp G, and reciprocating cutter D, of the chuckblocks R R, arranged to be adjusted relatively to the cutter on diverging lines, substantially as and for the purposes set forth.

6. The combination, with the table B, clamp O, and reciprocating cutter D, of the adjustable feeding device for varying the inclination of the cutter, and one or more chuck-blocks provided with adjusting-screws for regulating the depth of the cut, substantially as described.

WILLIAM P. DAVIS.

Witnesses:

GEO. B. SELDEN, H. G. PHILLIPs.

ICO 

